84140281 has 8 divisors (see below), whose sum is σ = 87147720. Its totient is φ = 81139968.

The previous prime is 84140269. The next prime is 84140291. The reversal of 84140281 is 18204148.

It can be written as a sum of positive squares in 4 ways, for example, as 53890281 + 30250000 = 7341^2 + 5500^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84140281 - 2⁵ = 84140249 is a prime.

It is a super-2 number, since 2×84140281² = 14159173773517922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84140291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36495 + ... + 38731.

It is an arithmetic number, because the mean of its divisors is an integer number (10893465).

Almost surely, 2^84140281 is an apocalyptic number.

It is an amenable number.

84140281 is a deficient number, since it is larger than the sum of its proper divisors (3007439).

84140281 is a wasteful number, since it uses less digits than its factorization.

84140281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3563.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 84140281 is about 9172.8011534100. The cubic root of 84140281 is about 438.1955733711.

The spelling of 84140281 in words is "eighty-four million, one hundred forty thousand, two hundred eighty-one".